Micro-pin reducer



Oct. 11, 1955 E. JOHNSON 2,720,131

MICRO-PIN REDUCER Filed Dec. 31, 1952 473 fa IN VEN TOR. EM/V Jay/100W QM QMQQM nited States Patent MICRO-PIN REDUCER Edwin Johnson, Brooklyn, N. Y.

Application December 31, 1952, Serial No. 328,930

2 Claims. (Cl. 82-35) This invention relates to machine lathe tool-bit holders.

It is an object of the present invention to provide a tool-bit holder which combines means for laterally and finely adjusting the tool-bit against the sides of the stock, a removable bushing receiving the uncut stock therewithin transversely of the holder and an adjustable gauge abutting the free end of the stock, limiting the movement of the stock through said bushing to thereby limit the length of stock cut by the tool-bit.

lt is another object of the present invention to provide a tool-bit holder of the above type wherein novel means are provided for xing the means for laterally and nely adjusting the tool-bit against the sides of the stock to thereby prevent variations in the diameter of the cut stock longitudinally.

Other objects of the present invention are to provide a tool-bit holder bearing the above objects in mind which is of simple construction, inexpensive to manufacture, has a minimum number of parts, is easy to use and etiicient in operation.

For other objects of the invention and for a better understanding thereof reference may be had to the following detailed description taken in connection with the accompanying drawing, in which:

Fig. 1 is a perspective view of a tool-bit holder embodying the features of the present invention;

Fig. 2 is a vertical sectional view taken alongline 2 2 of Fig. l;

Fig. 3 is a vertical sectional view taken along line 3--3 of Fig. 2;

Fig. 4 is a horizontal sectional view taken along line 4 4 of Fig. 2;

Fig. 5 is an exploded, perspective view of certain of the parts of the invention;

Fig. 6 is a side elevational view of a modified form of the invention and Fig, 7 is a vertical sectional view taken along line 7-7 of Fig. 6.

Referring more in detail to the drawing, in which similar reference numerals identify corresponding parts throughout the several views, there is shown a tool-bit holder, referred to collectively as 10, and including a substantially rectangular body 11 adapted to be mounted on a machine lathe transversely of the stock12 and rotating chuck 13 in the usual manner of tool holders, as shown in Figs. 1 and 4.

The outer end of body 11 is integrally formed with an enlargement 14 extending laterally from the body 11 at right angles, as shown in Fig. 1, and downwardly from the body 11 at right angles,` as shown in Fig. 2. As shown in Fig; 2, the bottom portion of enlargement 14 is longer than the upper portion thereof and is separated therefrom by means of an L-shaped groove 15 of rectangular cross section having an enlarged portion 16 and a narrow portion 17, the latter piercing the end of enlargement 14, substantially as illustrated. The inner wall of groove 15 and portions 16 and 17 thereof is coplanar with the side Wall of body 11.

The body 11 and enlargement 14 are provided with a circular opening 18, while the body 11 adjacent the enlargement 14 is provided with an elongated slot 19. As shown in Fig. 4, the body 11 is also provided with a vertical opening 20, the periphery of opening 20 intersecting the longitudinal sides of opening 18, substantially as illustrated.

An L-shaped member 21 is slidably disposed within slot 15, the vertical portion of member 21 slidably abutting the portion of body 11 surrounding slot 19 and having a horizontal, internally threaded opening 22 aligned with slot 19. The other horizontal portion of member 21 is provided with an inwardly extending, internally threaded opening 22.

A block 23 having a rectangular slot 24 is provided with a horizontal opening 25 adapted to be aligned with openings 22 and 19, these aligned openings receiving a screw 26 secured therewithin by means of a nut 27, a washer 28 and split-ring washer 29 being located on screw 26 intermediate nut 27 and body 11, substantially as illustrated, the washer 28 and split-ring washer 29 iacilitating longitudinal movement of screw 26 within slot 19 in a manner to be hereinafter described.

The upper portion of member 21 is slotted as at 30 and receives intermediate this slotted portion and block 23 a tool-bit 31, the tool-bit 31 being secured therewithin by tightening the screw 26 into threaded opening 22, as shown in Fig. 3. It will be noted that the nut 27, washer 28 and split-ring washer 29 serve then to slidably secure the screw 26 and its associated parts within the slot 19, and do not serve directly to secure tool-bit 31 in its proper position. i

Longitudinal movement of member 21 is controlled by a screw 32 located in threaded opening 22, the screw 32 being integrally formed with a circular flange 33 extending into portion 16 preventing outward displacement of screw 32 and a dial 34 abutting the end of enlargement 14 and preventing inward displacement of screw 32, substantially as illustrated.

The end of screw 32 adjacent dial 34 is integrally formed with a manually operable, knurled knob 35 upon rotation of which the member 21 will move longitudinally within slot 15, as will be obvious.

The outer face of dial 34 is calibrated and cooperates with arrow 36 marked on the end of enlargement 14 to indicate the displacement of member 21 within slot 15 and thereby the movement of tool-bit 31 against the stock 12.

A cover plate 37 is secured to enlargement 14 by means of internally threaded openings 38 in the latter and screws 39, substantially as illustrated in Figs. 1 and 2.

A bushing 40 is removably secured within opening 18 by means of a pin 41 having au arcuate slot 42 surrounding the side of bushing 40, the pin 41 being located in opening 20 and being urged against the bushing 40 by means of a threaded enlargement 43 which receives an internally threaded, knurled knob 44. To remove the bushing 40 and replace the same by a different bushing, not shown, having a diiierently sized bore to accommodate a differently sized stock, not shown, it is only necessary to untighten knob 44, as will be obvious.`

As shown in Fig. 4, the bushing 40 is adjusted within opening 18 until the front face of the former is aligned with the front face of enlargement 14, with the cutting edge of tool-bit 21 moving freely thereacross.

As shown in Fig. 3, the body 11 and enlargement 14` are provided with an opening 45 into which is press tted a shaft 46. A stop plate 47 is provided with an opening 4S slidably receiving shaft 46, the bottom end of plate 47 being slotted as at 49 and tapped to receive a lock screw 50 whereby to lock the position of plate 47 longitudinally on shaft 46, as will be obvious.

In operation, with the body 11 mounted above the machine lathe adjacent chuck 13 and the tool-bit 31 secured in place, as shown in Fig. l, the bushing 40 iS locked in place by means of knob 44 with the stock 12 movable longitudinally therewithin, the latter being slidable within chuck 13. The stop plate 47 is then adjusted to the desired position on shaft 46 by means of lock screw 50, the distance from the inner face of stop plate 47 to the front face of bushing 40 representing the length of stock to be turned. The stock 12 is then fed through bushing 40 from chuck 13 until the end thereof abuts stop plate 47, at which point the other end of the stock is locked within chuck 13.

When the tool-bit 31 moves longitudinally along stock 12 from the outer, free end thereof, the latter revolving within rotating chuck 13, this movement will be accurately limited by stop plate 47, which abuts the end of the stock when the proper length has been turned, as shown in Fig. 4. The transverse depth of the turning will, of course, be accurately controlled by the knob 35 and dial 34, as will be obvious.

It should now be apparent that there has been provided a tool-bit holder which combines means for laterally and finely adjusting the tool-bit against the sides of the stock, a removable bushing receiving the uncut stock therewithin transversely of the holder and an adjustable gauge abutting the free end of the stock, limiting the movement of the stock through said bushing to limit thereby the length of stock cut by ythe tool.

A combination turning and parting tool, which turns and cuts off the stock to the desired length in one operation may be substituted for the tool-bit 21, without departing from the scope of the present invention. Such combination turning and parting tools are well known in the art and have not therefore been shown in the drawing or described in detail.

Referring now particularly to Figs. 6 and 7, there is shown a modified dial 34 carried by screw 32, the dial 34 being integrally formed with a hollow sleeve 35 which rotatably receives a hollow cylinder 51. The cylinder 51 is provided at its inner end with radially spaced openings 52 and is internally threaded at its other end to receive a longitudinally adjustable screw 53 having a manually operable, knurled head 54, substantially as illustrated. The inner end of screw 53 tapers to a point and cooperates with balls 55 located in openings 52, urging the latter outwardly against sleeve 35 upon rotation of head 54, fixing the dial 34 in any position, insuring a cut stock of uniform diameter longitudinally.

It should now be apparent that there has been provided a tool-bit holder of the above type wherein novel means are also included for xing the means for laterally and finely adjusting the tool-bit against the sides of the stock to thereby prevent variations in the diameter of the cut stock longitudinally.

It has been found in practice that it is impossible to reduce pins to relatively small diameters, such as twentythousandths, by the use of a lathe, by itself, but when my micro-pin reducer hereinabove described is utilized, this operation is accomplished very easily.

While various changes may be made in the detailed construction, it shall be understood that such changes shall be within the spirit and scope of the invention as dened by the appended claims.

Having thus set forth and disclosed the nature of my invention, what is claimed is:

1. In a machine lathe having a rotating chuck and a revolving stock carried by said chuck, a tool bit holder comprising a body portion adapted to be mounted near the end of the chuck and transversely of the stock, removable bushing means carried by the end of said body portion and slidably receiving the stock, transversely adjustable, toolbit carrying means carried by the end of said body portion near said bushing means and longitudinally adjustable gauge means carried by said body portion below said bushing means adapted to abut the free end of the stock whereby to limit the movement of the stock through said bushing means said transversely adjustable, tool-bit carrying means comprising a lateral enlargement at the end of said body portion, on one side thereof, said enlargements having an elongated groove near the bottom thereof extending substantially parallel to the longitudinal sides of said body portion and extending inwardly from the inner vertical side of said enlargement, said groove being enlarged vertically near the outer vertical side of said enlargement, said groove continuing longitudinally through the outer end of said enlargement, the inner wall of said groove being substantially co-planar with the adjacent side of said body portion, a substantially L-shaped member having a horizontal portion slidable in said groove and a vertical portion adapted to slidably abut the adjacent face of said body portion, said body portion adjacent said vertical portion of said L-shaped member having an elongated slot substantially parallel to said groove in said enlargement, said vertical portion of said L-shaped member having an internally threaded opening aligned with said elongated slot, a substantially L-shaped bracket disposed on said vertical portion of said L-shaped member and having an opening aligned with said slot and internally threaded opening, an elongated screw within said aligned openings passing through said slot, means for preventing outward displacement of said screw from said slot, a toolbit frictionally held intermediate the vertical portion of said bracket and the vertical portion of said L-shaped member, the horizontal portion of said L-shaped member having an internally threaded opening extending inwardly from the end thereof, an elongated screw adjustable within said opening in said horizontal portion and extending outwardly of said groove through the outer end of said enlargement, a vertically extending flange carried by said screw within said enlarged portion of said groove, and a calibrated dial carried by said screw adjacent the end of said enlargement, said removable bushing means comprising said body portion and said enlargement having an opening therethrough at substantially right angles to said groove, a bushing slidably located within said opening, said body portion having a vertical opening, the periphery of said vertical opening intersecting the longitudinal sides of said bushing opening, a pin within said vertical opening having an arcuate slot adapted to receive the side of said bushing and means for first rotating and then pulling said pin against said bushing side external of said body portion.

2. A tool-bit holder according to claim 1, said adjustable gauge means comprising a shaft xedly carried by said enlargement below said bushing, said shaft extending substantially parallel to the longitudinal axis of said bushing, a vertically extending stop plate slidable along said shaft at substantially right angles thereto, and means for locking the position of said stop plate on said shaft, said stop plate being adapted to abut the free end of the stock passing outwardly through said bushing.

References Cited in the ille of this patent UNITED STATES PATENTS 43,776 Jillson Aug. 9, 1864 188,010 Hazelton Mar. 6, 1877 245,668 Smith Aug. 16, 1881 251,620 Mitchell Dec. 27, 1881 937,888 VStevenson Oct. 26, 1909 1,125,778 Waite Ian. 19, 1915 1,900,261 Storm Mar. 7, 1933 2,114,926 Kneff Apr. 19, 1938 

